Who's the most popular Power Ranger ever? Despite there being many, many candidates -- thanks to the show's 21 year history -- it's almost certain that Tommy Oliver (played by Jason David Frank) would win any poll on the subject.

The Power Rangers veteran, who starred in four different incarnations of the series (the original Mighty Mophin Power Rangers, Power Rangers: Zeo, Power Rangers: Turbo and Power Rangers: Dino Thunder) and also guest starred in Power Rangers: Wild Force, is returning for the first time in years for the Power Rangers: Super Megaforce finale this coming Saturday... and he's not alone.

Frank is one of many veterans of the series who is guest starring in "Legendary Battle", which was filmed as part of the show's 20th anniversary celebration this past year.

IGN has an exclusive clip for you from the episode, as the current Power Rangers meet Tommy -- back in his original Green Ranger costume -- and others from the past.